Fermi function

The method can be applied to the functions with two free coefficients, such as the Fermi function, so that it can be used to recover the graded index profiles with wide variation range.

该方法把统计优化手段导入循环迭代法，可适用于费米函数这一类曲线变化范围大、且有多个自变量的函数。

The researches show that the Fermi function can be used to describe the refractive-index profiles of the ion-exchanged planar waveguides.

研究表明，采用Fermi函数可以很好地描述离子交换平面光波导折射率分布情况。

Also, the ratio of the transition probability excited by double photon to that excited by a single photon is calculated and the numerical solution is found within the range of Fermi level and work function of various common metals.

计算了双光子激发与单光子激发跃迁几率之比，并在一般金属Fermi能级和功函数范围内求得了数值解。